Call tones or caller tunes replace the ringing sound callers hear on your mobile phone. As of January 2011, caller tunes are 90p per month for monthly access to the service and £1.20 per tune. Caller tunes are valid for 12 months from the date of purchase but have the ability to be renewed at the end of the subscription period as of early 2011. You can purchase several tunes for your phone and switch them as often as you desire, as long as the tunes are valid.
Open the T-Mobile web page and log in to your online account.
Click "Customize and shop."
Click "Caller tunes."
Click "Manage caller tunes."
Scroll to and click "My collection."
Click the assign icon for the song you would like to change your caller tune to become. The assign icon looks like a piece of paper with the plus "+" symbol in the top right corner.
Click the "Assign" box next to the caller list you would like to hear the caller tune.
Click "Save." Your caller tune will be updated.